# operator-(ranges::slide_view::sentinel)

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< cpp‎ | ranges‎ | slide view‎ | sentinel

friend constexpr ranges::range_difference_t<V> operator-( const /*iterator*/<false>& x, const /*sentinel*/& y ) requires std::sized_sentinel_for<ranges::sentinel_t<V>, ranges::iterator_t<V>>; | (1) | (since C++23)
friend constexpr ranges::range_difference_t<V> operator-( const /*sentinel*/& y, const /*iterator*/<false>& x ) requires std::sized_sentinel_for<ranges::sentinel_t<V>, ranges::iterator_t<V>>; | (2) | (since C++23)

Computes the distance between the underlying iterator of x and the underlying sentinel of y.

Let `last_ele_` denote the underlying iterator of x and `end_` denote the underlying sentinel of y.

1) Equivalent to: return x.last_ele_ - y.end_;.
2) Equivalent to: return y.end_ - x.last_ele_;.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when `slide_view::sentinel` is an associated class of the arguments.

### Parameters

x | - | an iterator
y | - | a sentinel

### Return value

The distance between the iterator and the sentinel.

### Example

| This section is incomplete Reason: no example

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